Dichloromethane → 3-(Dodecane-1-sulfonyl)-2-(nitromethylidene)-1,3-thiazinane

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1.6 g of 2-(nitromethylene)-tetrahydro-2H-1,3-thiazine, 3.18 g of ethyldiisopropylamine and 20 ml of methylene chloride were mixed. The mixture was cooled to and stirred at -60° C. under a nitrogen atmosphere while 2.95 g of dodecanesulfonyl chloride was added in portions over a 10 minute period. The mixture was allowed to warm to 10° C. (2.5 hours), then stirred at 10° C. for 1 hour and at 20° C. for 1.5 hours. The resulting mixture was poured into water, and the organic phase was separated, dried (MgSO4), filtered and stripped of solvent. The residue, a gum, was chromatographed over silica gel, using methylene chloride as eluent. After workup the product was recrystallized from ethanol to give N-(dodecylsulfonyl)-2-(nitromethylene)-tetrahydro-2H-1,3-thiazine (3A) as a solid, m.p.: 116°-117° C.

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